Single nucleotide polymorphism charting of P. patens reveals accumulation of somatic mutations during in vitro culture on the scale of natural variation by selfing by Haas, FB, Fernandez-Pozo, N, Meyberg, R, Perroud, P-F, Göttig, M, Stingl, N, Saint-Marcoux, D, Langdale, JA, Rensing, SA